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2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)最新文献

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On-line adaptive RBF network in stationary and nonstationary environment 平稳和非平稳环境下的在线自适应RBF网络
B. Todorovic, M. Stankovic, S. Todorovic-Zarkula
Sequential adaptation of RBF network parameters and structure is achieved using extended Kalman filter (EKF). Criterion for network growing is obtained from Kalman filter's consistency test The optimal brain surgeon and optimal brain damage pruning methods are derived for networks which parameters are estimated by EKF. Criteria for neurons/connections pruning are based on the statistical parameter significance test.
利用扩展卡尔曼滤波(EKF)实现了RBF网络参数和结构的顺序自适应。通过卡尔曼滤波的一致性检验,得到了网络生长的判据,导出了由EKF估计参数的网络的最优脑外科医生和最优脑损伤修剪方法。神经元/连接修剪的标准基于统计参数显著性检验。
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引用次数: 0
ATM interworking unit with ISDN and Ethernet interfaces 具有ISDN和以太网接口的ATM互连单元
J. Neves
The convergence of telecommunications and computer communication technologies requires the development of interworking units to convert different data formats, protocols and control procedures. This paper describes the architecture of an electronic device, which is able to perform interworking functionalities between ATM, ISDN and Ethernet networks and presents several scenarios for interconnection environments.
电信和计算机通信技术的融合需要发展互联装置来转换不同的数据格式、协议和控制程序。本文描述了一种能够在ATM、ISDN和以太网之间实现互联功能的电子设备的体系结构,并给出了互联环境的几种场景。
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引用次数: 0
Three-element array antenna with triple-frequency operation in mobile telephone 移动电话中具有三频工作的三元阵列天线
S. I. Al-Mously, M. Al-Daghistani, Z. Alhamdani, M. Abousetta, K. Omran
Operating with multi-frequency and simultaneously mitigating the EMW hazard in the handset mobile telephone is the aim of this paper. To achieve this goal three arrays are constructed, each array, which contains three elements, corresponding to a different operating frequency. The operating frequencies chosen were 966.8 MHz, 1861 MHz and 1980 MHz. This choice enables the mobile to be compatible with different worldwide operating systems namely GSM-900, DCS-1800, PCS-1900 and DECT. The dimensions of each array and hence the power radiation pattern shall contribute greatly towards mitigating the hazard caused by the EM field radiated usually from the mobile set antenna.
多频工作,同时减轻手持移动电话的EMW危害是本文的研究目标。为了实现这个目标,构造了三个数组,每个数组包含三个元素,对应于不同的工作频率。选择的工作频率为966.8 MHz、1861 MHz和1980 MHz。这种选择使手机能够兼容全球不同的操作系统,即GSM-900, DCS-1800, PCS-1900和DECT。每个阵列的尺寸以及因此产生的功率辐射方向图将大大有助于减轻通常由移动天线发射的电磁场所造成的危害。
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引用次数: 2
Application of modal analysis for the enhancement of the performances of a UPFC controller in power oscillation damping 模态分析在提高UPFC控制器功率振荡阻尼性能中的应用
R. Caldon, A. Marí, A. Scala, R. Turri
The aim of this work is to investigate and evaluate the performance of UPFC (unified power flow controller) devices operating in a transmission system in order to control inter-area power oscillations originated by small disturbances. Particular emphasis is given in using the participation factor matrix in order to identify the state variables which mostly affect the modes of inter-area oscillations and to intervene on those state variables directly related to the FACTS action. The efficiency of the method is subsequently assessed by means of detailed dynamic simulations.
这项工作的目的是调查和评估在传输系统中运行的UPFC(统一功率流控制器)设备的性能,以控制由小干扰引起的区域间功率振荡。特别强调使用参与因子矩阵来识别最影响区域间振荡模式的状态变量,并对与FACTS作用直接相关的状态变量进行干预。随后,通过详细的动态仿真来评估该方法的有效性。
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引用次数: 7
CMOS mixed digital analog reconfigurable neural network with Gaussian synapses 具有高斯突触的CMOS混合数字模拟可重构神经网络
A.N. Al-Zeftawi, K.M. Abd El-Fattah, H. Shanan, T. Kamel
In the neuromorphic arena, different engineering problems require different neural network topologies. In view of this concept, the motivation was to build a reconfigurable neural network chip. The distributed Gaussian-neuron synapse is introduced as a new type of synapses. Also a new improved resolution current-mode winner-takes-all circuit is added to realize a self-organizing topology. The chip is organized into 4 partially connected tiles with 4/spl times/3 fully connected neurons per tile. The chip was fabricated through MOSIS in 1.2 /spl mu/m AMI CMOS process occupying an area of 2 mm /spl times/2 mm.
在神经形态领域,不同的工程问题需要不同的神经网络拓扑结构。基于这个概念,我们的动机是构建一个可重构的神经网络芯片。分布式高斯神经元突触是一种新的突触类型。此外,还增加了一种新的改进分辨率的电流模式赢家通吃电路,以实现自组织拓扑结构。芯片被组织成4个部分连接的块,每个块有4/spl倍/3个完全连接的神经元。该芯片采用1.2 /spl mu/m AMI CMOS工艺,面积为2mm /spl × / 2mm,采用MOSIS工艺制备。
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引用次数: 1
The role of user models in adaptive hypermedia systems 用户模型在自适应超媒体系统中的作用
A. Kavcic
Computers have been used in education from the beginning. Educational systems have developed first from computer assisted learning systems to more complex intelligent tutoring systems and hypermedia systems. Intelligent tutoring systems are knowledge centred and are able to adapt the instructional sequence to the particular user. On the other hand, hypermedia systems are based on hypermedia and the user can freely browse the learning material. The last two technologies have merged into so called adaptive hypermedia systems. They are actually hypermedia systems, which incorporate some intelligent tutoring techniques. Therefore, they offer the freedom of exploratory learning, yet dynamically adapt to the individual user's knowledge level and learning goals, provide intelligent guidance, and support the user in acquiring knowledge. In intelligent tutoring systems, the adaptation is based on user modelling. Since adaptive hypermedia systems take the adaptation principles from intelligent tutoring systems, they also use user models for adapting the system to a particular user. Hence, the user model is one of the most important components for adaptation. Although the adaptation itself can be realised through different techniques, it is always based on the user model. In the paper, adaptive hypermedia systems and their general structure are described first. Then the role of a user model is presented together with the various approaches to user modelling in adaptive hypermedia systems. Finally, we investigate user modelling in different educational adaptive hypermedia systems.
计算机从一开始就被用于教育。教育系统首先从计算机辅助学习系统发展到更复杂的智能辅导系统和超媒体系统。智能辅导系统以知识为中心,能够适应特定用户的教学顺序。另一方面,超媒体系统基于超媒体,用户可以自由浏览学习材料。后两种技术已合并为所谓的自适应超媒体系统。它们实际上是融合了一些智能辅导技术的超媒体系统。因此,它们既提供了探索性学习的自由,又能动态适应用户个人的知识水平和学习目标,提供智能引导,支持用户获取知识。在智能辅导系统中,适应性是基于用户建模的。由于自适应超媒体系统采用了智能辅导系统的自适应原则,它们也使用用户模型来使系统适应特定的用户。因此,用户模型是最重要的适应性组件之一。虽然适应本身可以通过不同的技术来实现,但它总是基于用户模型。本文首先介绍了自适应超媒体系统及其一般结构。然后介绍了自适应超媒体系统中用户模型的作用以及各种用户建模方法。最后,我们研究了不同教育自适应超媒体系统中的用户建模。
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引用次数: 51
The effect of strong parasitic synchronous and asynchronous torques in induction machine with rotor eccentricity 转子偏心对异步电机同步和异步强寄生转矩的影响
L. Gołębiowski, D. Mazur
Parasitic torque harmonics and stator current harmonics to rotational speed of the asynchronous motor are presented in this paper. To calculate these relationships a 2.5D finite element model has been used. The rotor bar skew has been simulated with the division of the electric machine into so called elementary machines having straight, but shifted against each other, rotor bars. The obtained results on both 2D and 3D graphs are presented to the rotational speed of the electric motor. Parameters for each particular harmonics have been found with these graphs. These graphs help to identify the origins of these harmonics as the co-action of the MMF of the stator current and the magnetic induction from the rotor in the airgap. Particular attention has been payed to how iron saturation influences these harmonics. The harmonics under study (in quantity of 18) has been taken under consideration, because they exhibited their presence in the above mentioned graphs as the functions of speed. Their origin has been also indicated on the graphs made as an extension of the Kluszczynski analytic/graphic diagrams.
给出了异步电动机的寄生转矩谐波和定子电流谐波与转速的关系。为了计算这些关系,使用了2.5维有限元模型。通过将电机划分为具有直转子杆但相互移位的所谓基本电机,模拟了转子杆的偏斜。在二维和三维图形上给出了电机转速的结果。在这些图中找到了每个特定谐波的参数。这些图表有助于确定这些谐波的起源,作为定子电流的MMF和转子在气隙中的磁感应的共同作用。特别注意的是铁饱和度如何影响这些谐波。所研究的谐波(数量为18个)已被考虑在内,因为它们在上述图形中显示为速度的函数。它们的起源也在作为Kluszczynski分析/图形图的扩展而制作的图上表明。
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引用次数: 5
Educating engineers for Europe 为欧洲培养工程师
M. Dodridge, I. Paterson‐Stephens
Countries surrounding the Mediterranean sea enjoy a climate which enables them to obtain significant revenue from their entertainment/leisure enterprises. Commerce and industry involved in such enterprises are increasingly making use of the advances in electrical, electronic and computer engineering and the requirements for engineering education must reflect emerging technologies. Engineering education has seen an explosion in the so called media technology, this often being at the expense of engineering principles. This paper considers the need to develop programmes of study which retain engineering principles and provides an applications bias towards emerging technologies. The skills obtained from this type of programme provide opportunities world-wide and the potential creative, as well as problem solving aspects, provides a high degree of job satisfaction. For example, a degree in Music Technology and Audio System Design offers advanced signal processing techniques which are taught alongside subjects such as studio engineering and acoustics. The delivery of such engineering principles is enhanced by the context in which they are explored. Subjects such as Digital Signal Processing can be brought to life in the context of audio applications, providing a useful vehicle for students to learn an advanced engineering topic and to acquire marketable skills. This is in stark contrast to a traditional approach provided by many engineering degree programmes, where a highly analytical and abstract treatment of signal processing principles is given, doing little to fire the imagination and enthusiasm of students.
地中海周边国家的气候使它们能够从娱乐/休闲企业中获得可观的收入。这些企业所涉及的商业和工业越来越多地利用电气、电子和计算机工程方面的进步,工程教育的要求必须反映新兴技术。工程教育在所谓的媒体技术方面出现了爆炸式增长,这通常是以牺牲工程原则为代价的。本文认为有必要制定研究计划,保留工程原理,并提供对新兴技术的应用偏见。从这类方案中获得的技能在世界范围内提供了机会,潜在的创造性和解决问题方面提供了高度的工作满意度。例如,音乐技术和音频系统设计学位提供先进的信号处理技术,与工作室工程和声学等科目一起教授。这些工程原理的传递通过它们被探索的环境得到加强。数字信号处理等科目可以在音频应用的背景下发挥作用,为学生学习高级工程主题和获得市场技能提供有用的工具。这与许多工程学位课程提供的传统方法形成鲜明对比,在传统方法中,对信号处理原理进行了高度分析和抽象的处理,几乎没有激发学生的想象力和热情。
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引用次数: 0
Artificial neural network based fault locator for EHV transmission system 基于人工神经网络的超高压输电系统故障定位
M. Joorabian
This paper describes the design and implementation of an accurate fault location technique using artificial neural networks (ANN) for the 400 kV Iranian transmission systems. The technique utilises voltage and current fault data at one line end only. These values are stored as waveform samples by a digital fault recorder (DFR) in the substations. The instantaneous three phase voltages and currents derived at the fault locator point on the line which contain fault information at different frequencies are used to train and test the artificial neural network (ANN). The paper presents the result of simulation studies to determine the performance and practical implementation of the technique.
本文介绍了一种基于人工神经网络(ANN)的400千伏伊朗输电系统精确故障定位技术的设计与实现。该技术仅利用线路一端的电压和电流故障数据。这些值以波形样本的形式存储在变电站的数字故障记录仪(DFR)中。利用线路上故障定位点处的瞬时三相电压和电流,提取不同频率的故障信息,对人工神经网络进行训练和测试。本文给出了仿真研究的结果,以确定该技术的性能和实际实现。
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引用次数: 5
The evolution of DSP architectures: towards parallelism exploitation DSP架构的演变:迈向并行开发
R. Sernec, M. Zajc, J. Tasic
This paper presents a path of parallelism exploitation in commercial programmable DSP processors. DSP processors have gained in their complexity and have adopted some very sophisticated parallelism extraction techniques, namely very long instruction word (VLIW) and SIMD designs. The intention is to show a development path of digital signal processors (DSP) and focuses on their features that allow parallel processing of algorithms.
本文提出了一种在商用可编程DSP处理器中实现并行性的途径。DSP处理器已经获得了其复杂性,并采用了一些非常复杂的并行提取技术,即非常长的指令字(VLIW)和SIMD设计。目的是展示数字信号处理器(DSP)的发展路径,并重点介绍其允许并行处理算法的特性。
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引用次数: 2
期刊
2000 10th Mediterranean Electrotechnical Conference. Information Technology and Electrotechnology for the Mediterranean Countries. Proceedings. MeleCon 2000 (Cat. No.00CH37099)
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